globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025995
论文题名:
Mineral dust over west and central Sahel: Seasonal patterns of dry and wet deposition fluxes from a pluriannual sampling (2006–2012)
作者: Marticorena B.; Chatenet B.; Rajot J.L.; Bergametti G.; Deroubaix A.; Vincent J.; Kouoi A.; Schmechtig C.; Coulibaly M.; Diallo A.; Koné I.; Maman A.; Niaye T.; Zakou A.
刊名: Journal of Geophysical Research: Atmospheres
出版年: 2017
卷: 122, 期:2
起始页码: 1338
结束页码: 1364
语种: 英语
英文关键词: deposition ; mineral dust ; Sahel
Scopus关键词: annual variation ; atmospheric particle ; concentration (composition) ; dry deposition ; dust ; flux measurement ; mineral ; precipitation (climatology) ; sampling ; seasonal variation ; wet deposition ; Mali ; Niger [West Africa] ; Sahel [Sub-Saharan Africa] ; Senegal
英文摘要: Total and wet mineral dust deposition has been monitored since 2006 at three Sahelian stations in Senegal, Mali, and Niger, respectively at the weekly and the event time scale. Average annual deposited mass fluxes range from 75 to 183 g m−2 yr−1, from west to east. Deposition fluxes exhibit a clear seasonal cycle in Mali and Niger. High wet deposition fluxes result from an optimum phasing between dust concentration and precipitation: the maximum occurring at the beginning of the wet season, after the maximum of dust concentration and before the precipitation maximum. The contribution of wet to total deposition varies from 67% in Mali to 8% in Senegal. It is the main factor of variability of the deposition fluxes from year to year and at the seasonal scale in Niger and Mali. Wet deposition fluxes in Mali and Niger are mainly due to the wash out of dust emitted by convective systems. In Senegal, the deposition fluxes are lower and dominated by dry deposition (92% of the annual deposition flux). This is due to the low occurrence of convective systems producing local dust emissions and intense wet deposition. The dry deposition fluxes are primarily driven by the variability of the dust concentration. The dry deposition velocities derived from our measurements are consistent with those estimated by theoretical models. Scavenging ratios computed from the measured wet deposition fluxes, dust concentrations, and precipitation are anticorrelated with precipitation amounts. This suggests that most of the atmospheric dust is scavenged at the very beginning of the precipitation events. ©2016. American Geophysical Union. All Rights Reserved.
资助项目: "Based on a French initiative, AMMA was built by an international scientific group and is currently funded by a large number of agencies, especially from France, UK, U.S., and Africa. It has been the beneficiary of a major financial contribution from the European Community's Sixth Framework Research Programme. The authors would like to thank the Institut d'Economie Rurale (IER) in Mali and the Institut de Recherche pour le Développement (IRD) in Senegal, for hosting two of our stations and in particular, Samba Traoré and Birama S. Coulibaly, respectively Delegate and administrator of the Station de Recherche Agronomique de Cinzana (Mali) and Tamsir Diop, responsible of the Station de Géophysique de Mbour (Senegal) for their help in logistics and local management. This work has also strongly benefited from the administrative support of the representations of IRD in Niger, Mali, and Senegal, thanks to all of them. The authors also warmly acknowledge Anaïs Féron and Cécile Gaimoz for their support to maintain and improve the SDT stations since 2012. The Sahelian Dust Transect is supported since 2010 by the Observatoire des Sciences de l'Univers EFLUVE and by the French national program AMMA-2. This work was also supported by the DRUMS (DeseRt dUst Modeling: performance and Sensitivity evaluation ; projet ANR-ASTRID-DRUMS-2012) research program funded by ASTRID fund call of the French Agence Nationale de la Recherche (ANR). The data from the SDT stations are distributed through the SDT distribution Web page: http://www.lisa.u-pec.fr/SDT/.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62756
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Laboratoire Interuniversitaire des Systèmes Atmosphériques, UMR CNRS 7583, Université Paris Est Créteil et Université Paris-Diderot, Institut Pierre Simon Laplace, France; IEES, UMR IRD 242, UPEC-UPMC-CNRS-INRA-UPD, Paris, France; IER-SRAC, Bamako, Mali; IMAGO, US191, IRD, Dakar, Senegal; IRD, Niamey, Niger

Recommended Citation:
Marticorena B.,Chatenet B.,Rajot J.L.,et al. Mineral dust over west and central Sahel: Seasonal patterns of dry and wet deposition fluxes from a pluriannual sampling (2006–2012)[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)
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